README.md in set_as_primary-0.1.2 vs README.md in set_as_primary-0.1.3

@@ -119,10 +119,10 @@
 ```ruby
 class AddPrimaryColumnToEmailAddresses < ActiveRecord::Migration[6.0]
   def change
     add_column :email_addresses, :primary, :boolean, default: false, null: false
     # NOTE: Please uncomment following line if you want only one 'true' (constraint) in the table.
-    # add_index :email_addresses, %i[user_id, primary], unique: true, where: "(email_addresses.primary IS TRUE)"
+    # add_index :email_addresses, %i[user_id primary], unique: true, where: "(email_addresses.primary IS TRUE)"
   end
 end
 ```
 You might have seen extra commented lines there. These lines are there for handling the unique constraint. Currently, these lines get created only for `PostgreSQL` adapter as it supports partial index.
 
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